|ICESP X CONFERENCE PAPER ABSTRACTS 7A SERIES
Held in Cairns,
Conference on Electrostatic Precipitation (ICESP)
is the official conference of the International Society for Electrostatic
ROBERT GUENTHER AND HELMUT HERDER
For over 40 years the most commonly used device to power electrostatic precipitators werestandard 50/60 Hz SCR Controller and Transformer/Rectifier sets. However, in the last 6 -7 years a new Power Supply has been introduced to the ESP industry. This Power supply is based on High Frequency Switch mode technology. The new Switch mode Power Supplies are capable of dramatically different performance than the older, 50/60-hertz linear transformer/rectifier sets.
As applied to the ESP application, these new power supplies will have a major impact onmany aspects of precipitator design, construction, operation, and maintenance.
This paper provides an overview of the operational and installation advantages of thePowerPlus; NWL’s switch mode power supply for ESP (electro static precipitator) applications.
tests of the two technologies were performed at several
PowerCompanies in the USA. These results will be shared in this
MARTIN KIRSTEN AND ANDERS KARLSSON
There is a slow but clear trend to change from conventional mains-frequency operated HVsupplypackages for Electrostatic Precipitators to HV-supplies that are high-frequency switched.
The main driver for this trend is the easy installation, smooth HVDC and the resultingimproved ESP collection efficiency. With more than 1200 high-frequency switched HV supplies in operation today, ALSTOM has gathered a sizeable experience in the use of such equipment.
In another paper presented at this conference, Lena Lillieblad et al discuss and comparedifferent ESP upgrade methods to reduce the emission – and mention the high-frequency switched HV-supplies as a "favourite" especially from the cost/achieved result point of view.
This paper focuses on the economy in using the high-frequency switched HV-supplies andstates that it is always profitable for the end user to use this type of equipment even though the component cost at first sight would seem higher.
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ARNE THOMAS HAALAND, FRODE VIK, ARILD NESSE, BJARTE KVINGEDAL, ØYVIND WETTELAND AND HÅVARD VETRHUS
One of the conclusions following the ICESP IX was that switched mode power suppliesgradually would gain the dominating position as power sources for industrial ESP’s. However, reliability issues, limitation in voltage/power rating and cost competitiveness compared to conventional T/R’s have limited the acceptance of this technology in the industry. As a solution to these obstacles, this paper describes a new and innovative design approach by presenting a modular switched mode power supply concept, the APP ModuPowerTM.
Development of the ModuPowerTM concept is based on more than 8 years of experience in development and delivery of switched mode power supplies to industrial plasma applications. It is a true modular concept where output voltage is decided by connecting the high voltage modules in series to the desired level, while output current capacity is decided by connecting modules in parallel. The modular concept is made possible by implementing a novel, patented high voltage transformer design, allowing serial connection of transformers without serious power/efficiency loss. In addition, low parasitics in the transformer, allows simplified switching techniques resulting in simple building blocks for the modular concept.
The modular approach decomposes the challenge of high voltages and high power ratingsinto manageable entities, while offering output voltages up to 120 kV and in principle, unlimited output power ratings. Furthermore, the modular concept is well suited for implementing redundancy inside the power supply, resulting in a fault tolerant system, and thereby increased reliability. Simple and efficient building blocks in a modular configuration, result in a small and cost competitive power solution compared to conventional power sources.
Through the development of ModuPowerTM, APP aim at solving the major objections towards using switched mode power supplies in ESP applications, which hopefully moves us closer to the long announced paradigm shift in this industry.
Last updated: May 10, 2009.
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